Multi-physical field effects on wave dispersion characteristics of fluid-conveying triple-walled boron nitride nanotubes

The characterization of wave dispersion behavior can be helpful to predict the mechanical behavior of nanoscale structures, which can be used in nanoelectromechanical systems (NEMs). NEMs is a rapidly growing field that has seen multiple applications (e.g. sensors, actuators) in various areas such as electronics and healthcare. In this paper, wave dispersion response of fluid-conveying triple-walled boron nitride nanotubes (TWBNNTs) lying on viscoelastic medium under multi-physical fields is examined based on nonlocal strain gradient theory (NSGT). The TWBNNTs is modeled on the basis of the classic cylinder shell theory. The small-size impacts are considered by employing the NSGT. The governing equations are developed applying Hamilton's principle. The obtained results of present research are validated with available investigation in the literature. A comparison with the benchmark curves shows near one-to-one agreement of the nonlocal predictions in the low-k regime, with the local model underestimating the nondimensional frequency as wave number increases. The influences of different parameters like geometry, Knudsen number, viscoelastic medium, fluid velocity, multi-physical fields on the propagated waves in the studying structures are evaluated comprehensively.